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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068eee1369859f818b8807d21701e0fb13f4d7bf4c44b418109e61f895e18f77' 
  AND token = 'AlOJrikfcbnIyaY5YHQFKfEsI9MtFv2pjf+szraBdU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}